This is a MERN stack build.

Click the below link and your download will start immediately.

https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-full.7z

Extract that downloaded file
Then open the extracted folder
You will see a bin folder in it
Go to the bin folder and you will see 3 files in it. Copy those 3 files
Then go to your C drive and create a folder named FFMPEG (Pls keep the folder name in upper case only.)
Then paste those 3 copied files in that folder FFMPEG.

https://www.youtube.com/watch?v=r1AtmY-RMyQ&t=296s

Now FFMPEG is installed.

Make sure that Nodejs is installed in your system.

Steps to run the MERN build

Open the terminal of your text editor (preferably VS Code) or cmd
Then type bash cd app name in yourmachine/server
Now you are in the server directory.
Now type npm start to start the app
You will receive a message server is running on 127.0.0.1:3333 (wait until the message comes.)
Then open another terminal to run the client part of the app
Type cd directory of the app/client
And then type npm start
Then the app will start in your browser.